Steel Industry
IS 1514 certified high-reactivity CaO — trusted by steel plants across India for BOF/EAF desulphurisation, slag formation, and flue gas treatment.
Quick lime (calcium oxide, CaO) is an essential raw material in steel manufacturing. It is used in Basic Oxygen Furnaces (BOF), Electric Arc Furnaces (EAF), and ladle metallurgy for desulphurisation, slag formation, and refining of hot metal and steel. The high temperatures inside steel furnaces (1,400–1,600°C) demand a lime with high reactivity and high CaO content.
Unlike hydrated lime, quick lime is used directly in steel plants because its high reactivity at furnace temperatures makes it more effective than pre-hydrated lime. The CaO reacts rapidly with sulphur, phosphorus, and other impurities to form slag, which is separated from the steel melt. Reactivity — measured as t60 (time to reach 60°C in a standard slaking test) — is the critical quality parameter for steel plant lime.
Quick lime is injected into hot metal (molten pig iron) in the torpedo ladle or desulphurisation station to remove sulphur before it enters the BOF. CaO reacts with dissolved sulphur to form calcium sulphide (CaS), which is removed with the slag. Reducing sulphur in hot metal is critical for producing high-quality, low-sulphur steel grades.
In the Basic Oxygen Furnace (BOF), quick lime is charged with the hot metal to form a fluid slag that captures phosphorus, sulphur, and silicon from the steel melt. The lime basicity of the slag (CaO/SiO₂ ratio) is carefully controlled to achieve the required steel chemistry. High-purity, high-reactivity lime ensures rapid slag formation and efficient refining.
In Electric Arc Furnaces (EAF) used for scrap-based steelmaking, quick lime is added to form a foamy slag that protects the furnace lining, improves energy efficiency, and removes impurities from the scrap melt. Lime quality — particularly reactivity and CaO content — directly affects EAF productivity and energy consumption.
In ladle furnaces and secondary metallurgy stations, quick lime is used for further desulphurisation, dephosphorisation, and inclusion removal to achieve the precise chemistry required for high-grade steel products. This stage requires the highest purity lime for clean steel production.
Steel plants with sintering machines, coke ovens, and other SO₂-emitting processes use quick lime in dry or semi-dry FGD systems to reduce stack emissions. Quick lime reacts with SO₂ to form calcium sulphite/sulphate, meeting CPCB emission norms. High-reactivity lime ensures maximum SO₂ capture efficiency.
| Application | Recommended Grade |
|---|---|
| Hot metal desulphurisation | High Reactivity (88–92% CaO) |
| BOF slag formation | High Reactivity (88–92% CaO) |
| EAF steelmaking | High Reactivity (85–92% CaO) |
| Ladle metallurgy | Ultra High Reactivity (90–92% CaO) |
| Flue gas desulphurisation | High Reactivity (85–90% CaO) |
Our quick lime meets IS 1514 (BIS) specifications for industrial quick lime. Reactivity (t60), CaO content, and MgO content tested and certified with every batch.
Our High Reactivity grade achieves t60 < 3 minutes in standard slaking tests — meeting the reactivity requirements of BOF, EAF, and desulphurisation applications.
In-house laboratory tests every batch for CaO content, MgO content, and reactivity before dispatch. Batch-wise test reports available for your quality records.
Steel plants require uninterrupted lime supply. We maintain production capacity and inventory to support monthly contracts of 50–500 MT with consistent delivery schedules.
From Pipar City, Jodhpur, we supply to steel plants across Rajasthan, Gujarat, Maharashtra, Chhattisgarh, Jharkhand, Odisha, and other steel-producing states.
Our team can advise on lime grade selection, dosage rates, and handling requirements for your specific furnace type and steel grade requirements.
Tell us your grade, monthly requirement, and delivery location. We respond within 2 hours with a detailed price quote.